The length of a potentiometer wire is 5 metres. An electron in this wire experiences a force of 4.8 × 10^-19 newton, emf of the main cell used in potentiometer is

 Two identical batteries each of emf 2 V and internal resistance 1Ω are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across R using these batteries is

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and  200 V lamp when not in use?

In electrolysis the mass deposited on an electrode is directly proportional to :

A 220 volt, 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will  be

 A steady current of 1.5 A flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is 30 ×10^-5g C^-1,the mass of copper deposited on the electrode will be :

The negative Zn pole of a Daniell cell, sending a contant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is

Three equal resistors connectd in series across asource of emf together dissipate 10 w of power. What will be the power dissipated in watt if the same resistors are connected in parallel across the same source of emf?

Kirchhoff's current law at a junction deals with conservation of 

The resistance of a discharge tube is